Autonomous systems drift apart unless there is something fixed to reconcile against, and every drift that needs a human is the end of autonomy. So we built the gravity: one record, checkable by either side, reading the same for both. Disputes sink below the human layer, where machines resolve them on their own.
Usage-based billing and agentic commerce are two expressions of the same market. In both, one party's word becomes the other party's bill. We commit that word to a record before the invoice, so the bill turns from something you trust into something you check. We record. We never decide.